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[RFC,v2,2/7] API: Add macro for the container_of trick

Message ID 20210302152510.15116-3-rpalethorpe@suse.com
State Changes Requested
Headers show
Series CGroup API rewrite | expand

Commit Message

Richard Palethorpe March 2, 2021, 3:25 p.m. UTC 
Signed-off-by: Richard Palethorpe <rpalethorpe@suse.com>
---
 include/tst_common.h | 5 +++++
 1 file changed, 5 insertions(+)

Comments

Li Wang March 8, 2021, 8:39 a.m. UTC | #1 
On Tue, Mar 2, 2021 at 11:28 PM Richard Palethorpe <rpalethorpe@suse.com>
wrote:

> Signed-off-by: Richard Palethorpe <rpalethorpe@suse.com>
> ---
>  include/tst_common.h | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/include/tst_common.h b/include/tst_common.h
> index fd7a900d4..317925d1d 100644
> --- a/include/tst_common.h
> +++ b/include/tst_common.h
> @@ -83,4 +83,9 @@
>  #define TST_RES_SUPPORTS_TCONF_TFAIL_TINFO_TPASS_TWARN(condition) \
>         TST_BUILD_BUG_ON(condition)
>
> +#define tst_container_of(ptr, type, member) ({              \
>

What about using uppercase here?  i.e  TST_CONTAINER_OF(...)



> +       const typeof( ((type *)0)->member ) *__mptr = (ptr); \
> +       (type *)( (char *)__mptr - offsetof(type,member) );  \
> +})
> +
>  #endif /* TST_COMMON_H__ */
> --
> 2.30.0
>
>
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Patch

diff --git a/include/tst_common.h b/include/tst_common.h
index fd7a900d4..317925d1d 100644
--- a/include/tst_common.h
+++ b/include/tst_common.h
@@ -83,4 +83,9 @@ 
 #define TST_RES_SUPPORTS_TCONF_TFAIL_TINFO_TPASS_TWARN(condition) \
 	TST_BUILD_BUG_ON(condition)
 
+#define tst_container_of(ptr, type, member) ({		     \
+	const typeof( ((type *)0)->member ) *__mptr = (ptr); \
+	(type *)( (char *)__mptr - offsetof(type,member) );  \
+})
+
 #endif /* TST_COMMON_H__ */